KR20160112166A - Device and system for linear automatic protection switching in optical transport network system, and method using the same - Google Patents

Device and system for linear automatic protection switching in optical transport network system, and method using the same Download PDF

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Publication number
KR20160112166A
KR20160112166A KR1020150037357A KR20150037357A KR20160112166A KR 20160112166 A KR20160112166 A KR 20160112166A KR 1020150037357 A KR1020150037357 A KR 1020150037357A KR 20150037357 A KR20150037357 A KR 20150037357A KR 20160112166 A KR20160112166 A KR 20160112166A
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South Korea
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transmission medium
protection switching
automatic protection
switching device
failure information
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KR1020150037357A
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Korean (ko)
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이승우
김호건
윤지욱
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한국전자통신연구원
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Publication of KR20160112166A publication Critical patent/KR20160112166A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03—Arrangements for fault recovery
    • H04B10/032—Arrangements for fault recovery using working and protection systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

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  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention provides an apparatus and system for performing linear automatic protection switching in an optical transmission network system, and a method using the same. An object of the present invention is to provide an effective linear automatic protection switching device and system at the level of ODUk, and a method using the same, by improving the protection switching time by configuring an apparatus for performing protection switching in hardware.
The present invention detects signal failure information of an operation path and a backup path, determines a switching state of an operation path and a spare path, generates an instruction to control activation of a traffic path based on the switching state, A change of the traffic path can be performed.
The present invention can replace the protection switching performed by the software having a relatively slow processing speed, and the automatic protection switching device can be configured in hardware to perform the switching quickly.

Figure P1020150037357

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear automatic protection switching apparatus and system in an optical transmission network system,

The present invention discloses a linear automatic protection switching device and system, and a method using the same. More particularly, the present invention discloses an automatic protection switching apparatus and system for a linear protection switching at an optical channel data unit (ODUk) level in an optical transport network system, and a method using the same.

The optical transmission network system can perform functions of transporting, multiplexing, routing, and monitoring signals of a client layer over an optical domain. The optical transport network system encapsulates signals of the client layer in the optical transmission network and can transmit the packets to a layer including an optical channel transport unit (OTU), an optical channel data unit (ODUk), and an optical channel payload unit (OPUk). However, k may be different values (e.g., k = 1, 2, or 3) depending on the bit rate. The frame format of the optical transport network is defined in ITU-T Recommendation G.709, consisting of OTUk, ODUk, and OPUk overhead, and includes an OPUk payload area and an FEC area.

In order to perform linear protection switching in optical transmission network systems, the Automatic Protection Switching (APS) as defined in ITU-T Recommendation G.873.1 　 ) Protocol. This Recommendation defines the various linear protection switching methods of optical transport network systems at the ODUk level. It also describes the purpose and application of the transfer method.

1 shows a configuration for performing a conventional linear automatic protection switching in an optical transmission network system.

1 shows two transmission mediums 103 and 105 belonging to the operation path 101 and two transmission mediums 104 and 106 belonging to the redundant path 102. [ Each transmission medium corresponds to a line card of the optical transmission network system. The illustrated four transmission mediums 103, 104, 105 and 106 include optical transport network (OTN) framers 107, 110, 111 and 114, general purpose processors 108, 109, 112, And 113). The general purpose processors 108, 109, 112, and 113 may be CPUs, each of which can receive signal failure information, etc., from optical network framers 107, 110, 111, and 114, have.

Conventional protection switching in the optical transmission network system is performed through communication between the OTN framer, the host processor, and the upper main processor mounted on the line card of the optical transmission network system. A host processor (or a general-purpose processor and a central processing unit) uses an APS frame, an OAM frame, and the like, operates and processes the APS protocol, which is a linear protection switching protocol, and performs protection switching on the transmission path. For this, the failure information in the transmission path is acknowledged by the OTN framer, and the failure information is transmitted to the host processor mounted on the line card. The host processor operates the APS protocol for protection switching and performs the switching function, .

In order to perform the protection switching in the optical transmission network system, the host processor can receive the signal failure information of the OTN framer using the periodic polling method. Also, the host processor can receive the signal failure information at an effective point in time using the interrupt method, and perform the protection switching. However, if the host processor receives the signal failure information using the periodic polling method, if the signal failure is detected in a short period, there is a problem that the load for the processing increases. In addition, even when the host processor performs the protection switching using the interrupt method, since the switching state for the transmission path is determined through the software for relatively slow processing speed and process for determining the protection switching, There is a problem that it is difficult to perform the ODUk level switching within 50 msec.

The present invention can improve the protection switching time in the optical transmission network system by providing a hardware auto configured linear automatic protection switching.

The present invention can provide an automatic protection switching device and a protection switching system that can replace a conventional central processing unit that performs protection switching.

The present invention can provide an effective automatic protection switching apparatus and system at ODUk level, and a method using the same.

An automatic protection switching apparatus of an optical transmission network system of the present invention includes: a detection unit for detecting first signal failure information based on a signal of a first transmission medium; A priority determining unit for determining a priority of failure signal processing of the first signal failure information and the second signal failure information based on the second signal failure information and the first signal failure information of the second transmission medium; A transfer status determination unit for determining whether to activate the traffic path of either the first transmission medium or the second transmission medium based on the failure signal processing priority and determining a switching status according to activation or non-activation; And a transfer command generator for generating a transfer command for changing a traffic path of the first transmission medium and the second transmission medium according to the transfer status.

The priority determining unit of the automatic protection switching apparatus of the present invention can determine the failure signal processing priority by referring to a predetermined priority table.

The priority determining unit of the automatic protection switching device of the present invention receives the instruction information from the operator to determine the instruction processing priority of the instruction information, and the switching state determining unit may determine the switching state based additionally on the instruction processing priority .

The transfer status determination unit of the automatic protection switching apparatus of the present invention performs an Automatic Protection Switching (APS) protocol of Recommendation G.873.1 of ITU-T to determine whether or not a first transmission medium And the automatic protection switching device can transmit the first APS message to the third transmission medium.

The transfer status determination unit of the automatic protection switching apparatus of the present invention may compare the failure signal processing priority and the previous failure signal processing priority and compare the command processing priority and the previous command processing priority to determine the transfer status.

The transfer status determination unit of the automatic protection switching apparatus of the present invention transmits the first APS message to the optical transmission network framer of the first transmission medium, and the optical transmission network framer transmits the first APS message to the ITU-T Recommendation G. 709 ODUk (Optical Data Unit k: ODUk) frame and transmit it to the third transmission medium.

The priority determination unit of the automatic protection switching apparatus of the present invention may determine the failure signal processing priority and the instruction processing priority based on the second APS message of the fourth transmission medium received from the fourth transmission medium.

The priority determining unit of the automatic protection switching apparatus of the present invention can receive the second APS message extracted from the Optical Data Unit k (ODUk) frame of ITU-T Recommendation G.709 by the optical transmission network framer of the first transmission medium have.

The detection unit of the automatic protection switching apparatus of the present invention detects the signal of the first transmission medium extracted from the ODUk (Optical Data Unit k; And the priority determining unit may receive the second signal failure information detected from the detection unit of the second linear automatic protection switching apparatus of the second transmission medium.

The detection unit of the automatic protection switching apparatus of the present invention detects the signal of the first transmission medium extracted from the ODUk (Optical Data Unit k; And the priority determining unit may receive the second signal failure information detected from the detection unit of the second linear automatic protection switching apparatus of the second transmission medium.

The automatic protection switching apparatus of the present invention may further include a delay timer for transmitting the first signal failure information and the second signal failure information to the priority determining unit after a predetermined delay time.

The transfer command generated by the automatic protection switching device of the present invention includes interrupt information, which is an instruction to interrupt the operation of the first transmission medium or the second transmission medium, and switching information for opening / closing the traffic path of the first transmission medium or the second transmission medium .

The transfer command generation unit of the automatic protection switching apparatus of the present invention transfers the transfer command to the general purpose processor of the first transmission medium, the general purpose processor executes the interrupt service routine based on the interrupt information, To the transport network framer to open and close the traffic path of the optical network framer.

The transfer command generation unit of the automatic protection switching apparatus of the present invention may transmit the transfer command to the optical transmission network framer of the first transmission medium to open and close the traffic path of the optical transmission network framer.

The transfer command generation unit of the automatic protection switching apparatus of the present invention may transmit the transfer command to the second transmission medium to control the activation of the second transmission medium.

In the optical transmission network system, the linear automatic protection switching system of the present invention detects the first signal failure information of the first transmission medium belonging to the redundant path, and detects the first signal failure information of the second transmission medium belonging to the operation path, A first automatic protection switching device for generating a first switching command for changing traffic paths of the first transmission medium and the second transmission medium based on the signal failure information; And a second automatic protection switching device for detecting the second signal failure information and transmitting the second signal failure information to the first automatic protection switching device and receiving the first switching command.

The first automatic protection switching device of the linear automatic protection switching system of the present invention controls the activation of the traffic path of the first transmission medium based on the first switching command and the second automatic protection switching device controls the activation of the traffic path of the first transmission medium based on the first switching command And control the activation of the traffic path of the second transmission medium.

The first automatic protection switching apparatus of the linear automatic protection switching system of the present invention generates a first APS message based on the failure signal processing priority of the first signal failure information and the second signal failure information, .

The linear automatic protection switching system according to the present invention is characterized in that, based on the first APS message, the third signal failure information of the third transmission medium, and the fourth signal failure information of the fourth transmission medium belonging to the operation path, A third automatic protection switching device for generating a second switching command for changing the traffic path of the fourth transmission medium; And a fourth automatic protection switching device for detecting the fourth signal failure information and transmitting the fourth signal failure information to the third automatic protection switching device and receiving the second switching command.

The third automatic protection switching device of the linear automatic protection switching system of the present invention controls the activation of the traffic path of the third transmission medium based on the second switching command and the fourth automatic protection switching device controls the activation of the traffic path of the third transmission medium based on the second switching command Lt; RTI ID = 0.0 > 4 < / RTI > transmission medium.

A linear automatic protection switching method of an optical transmission network system of the present invention includes: detecting first signal failure information based on a signal of a first transmission medium belonging to a redundant path; Determining a failure signal processing priority of the first signal failure information and the second signal failure information based on the second signal failure information and the first signal failure information received from the second transmission medium belonging to the operational path; Determining whether to activate the traffic path of either the first transmission medium or the second transmission medium based on the failure signal processing priority, and determining a switching status according to the activation status; And generating a switch command for changing a traffic path of the first transmission medium and the second transmission medium according to the switching condition.

The present invention can perform effective linear automatic protection switching at ODUk level by receiving signal failure information from an OTN framer and improving the protection switching time by configuring a state machine for protection switching in hardware.

The present invention can effectively perform the protection switching within 50 msec by configuring the automatic protection switching device by hardware in comparison with the conventional invention in which it is difficult to perform protection switching in units of ODUk within 50 msec through software.

FIG. 1 is a diagram illustrating an exemplary configuration for performing automatic protection switching of a conventional optical transmission network system. Referring to FIG.
2 is an exemplary diagram illustrating a configuration for performing automatic protection switching without using an APS message according to an exemplary embodiment of the present invention.
3 is an exemplary diagram illustrating a configuration for performing automatic protection switching using an APS message according to an exemplary embodiment of the present invention.
4 is a diagram illustrating a configuration of an automatic protection switching device according to an embodiment.
FIG. 5 is an exemplary diagram illustrating an automatic protection switching apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating an automatic protection switching method according to an embodiment.

Various modifications may be made to the embodiments described below. It is to be understood that the embodiments described below are not intended to limit the embodiments, but include all modifications, equivalents, and alternatives to them.

The terms used in the examples are used only to illustrate specific embodiments and are not intended to limit the embodiments. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this embodiment belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. In the following description of the embodiments, a detailed description of related arts will be omitted if it is determined that the gist of the embodiments may be unnecessarily blurred.

FIG. 2 is an exemplary diagram illustrating a configuration for performing automatic protection switching without using an APS message according to an exemplary embodiment of the present invention. Referring to FIG.

When a signal failure occurs at a receiving port of the optical transmission network framer 107 of the second transmission medium 103 belonging to the operational path 101, the optical transmission network framer 107 transmits the failure information information to the automatic protection switching device 202. The automatic protection switching device 202 of the second transmission medium 103 can detect signal failure or signal attenuation information from the signal received from the optical transmission network framer 107. [ The automatic protection switching device 202 can transmit the detected signal failure or signal attenuation information to the automatic protection switching device 201 of the backup path 102. [

The automatic protection switching device 201 of the first transmission medium 104 belonging to the backup path 102 uses the signal failure or signal attenuation information received from the automatic protection switching device 202 of the operation path 101, It may determine whether to change the traffic path of the first transmission medium 104 and the second transmission medium 103. [ The automatic protection switching device 201 can determine whether to activate the traffic path of either the first transmission medium 104 or the second transmission medium 103 and determine whether the first transmission medium 104 and the second transmission medium 103, 2 transmission medium 103 can be determined. The automatic protection switching device 201 can determine the protection switching state using the signal failure or signal attenuation information and can generate the switching command according to the switching state. The transfer command may include interrupt information and switching information. The interrupt information may be a command for requesting interruption of the operation of the processor or optical network framer, and the switching information may be a signal for performing opening and closing of the traffic path.

The automatic protection switching device 201 can forward the transfer command to the general purpose processor 109 of the first transmission medium 104. [ The general purpose processor 109 may perform a procedure for opening and closing the traffic path of the optical transmission network framer 110 using the transfer command generated by the automatic protection switching device 201. [ However, the automatic protection switching device 201 does not necessarily have to transmit the generated transfer command to the general purpose processor 109, but can directly transfer the generated transfer command to the optical transmission network framer 110 to perform opening and closing of the traffic path.

The automatic protection switching device 201 can also transmit the generated switching command to the automatic protection switching device 202 belonging to the operation path 101. [ The automatic protection switching device 202 of the second transmission medium 103 can activate the traffic path of the second transmission medium 103 by using the switching command received from the automatic protection switching device 201 of the backup path 102 Or deactivate the < / RTI > The automatic protection switching device 202 can transfer the interrupt information and the switching information switching instruction to the general purpose processor 108 of the second transmission medium 103 by referring to the received switching command. The general purpose processor 108 can perform opening and closing of the traffic path of the optical transmission network framer 107 using the transferred switch command. However, the automatic protection switching device 202 does not necessarily have to transmit the transferred transfer command to the general-purpose processor 108, but can directly transfer the transfer command to the optical transmission network framer 107 to perform opening and closing of the traffic path.

The general purpose processors 108 and 109 receiving the interrupt information and the switching information transmit the switching information to the optical network framers 107 and 110 to perform the ODUk switching in accordance with the determined switching state (ON or OFF) can do.

The configuration of each of the automatic protection switching devices 202 and 201 belonging to the transmission medium of the operation path 101 and the backup path 102 may be the same. Each of the automatic protection switching devices 202 and 201 which are the same device can perform different functions depending on which of the operation path 101 and the backup path 102 belongs. The automatic protection switching device 202 belonging to the operation path 101 detects and transmits the signal fault information and can perform activation or deactivation of the traffic path of the operation path 101 by receiving the changeover command. The automatic protection switching apparatus 201 belonging to the backup path 102 can receive the signal failure information of the operation path 101 and detect the signal failure information of the backup path 102 to determine the switching state, Can be generated. The automatic protection switching device 201 belonging to the backup path 102 can perform opening and closing of the traffic path of the backup path 102 using the generated switching command. In addition, the automatic protection switching device 201 belonging to the backup path 102 can transmit the switching command to the automatic protection switching device 202 belonging to the operation path 101. [

3 is an exemplary diagram illustrating a configuration for performing automatic protection switching using an APS message according to an exemplary embodiment of the present invention.

When a signal failure occurs at the receiving port of the optical transmission network framer 107 of the second transmission medium 103 belonging to the operational path 101, the optical network framer 107 transmits the failure information about the signal to the automatic protection switching device 202). The automatic protection switching device 202 of the second transmission medium 103 can detect signal failure or signal attenuation information from the signal received from the optical transmission network framer 107. [ The automatic protection switching device 202 can transmit the detected signal failure or signal attenuation information to the automatic protection switching device 201 of the backup path 102. [

The automatic protection switching device 201 of the first transmission medium 104 belonging to the backup path 102 uses the signal failure or signal attenuation information received from the automatic protection switching device 202 of the operation path 101, It may determine whether to change the traffic path of the first transmission medium 104 and the second transmission medium 103. [ The automatic protection switching device 201 can determine whether to activate the traffic path of either the first transmission medium 104 or the second transmission medium 103 and determine whether the first transmission medium 104 and the second transmission medium 103, 2 transmission medium 103 can be determined. The automatic protection switching device 201 can determine the protection switching state using the signal failure or signal attenuation information and can generate the switching command according to the switching state. The transfer command may include interrupt information and switching information. The interrupt information may be a command for requesting interruption of the operation of the processor or optical network framer, and the switching information may be a signal for performing opening and closing of the traffic path.

The automatic protection switching device 201 can forward the transfer command to the general purpose processor 109 of the first transmission medium 104. [ The general purpose processor 109 may perform a procedure for opening and closing the traffic path of the optical transmission network framer 110 using the transfer command generated by the automatic protection switching device 201. [ However, the automatic protection switching device 201 does not necessarily have to transmit the generated transfer command to the general purpose processor 109, but can directly transfer the generated transfer command to the optical transmission network framer 110 to perform opening and closing of the traffic path.

The automatic protection switching device 201 can also transmit the generated switching command to the automatic protection switching device 202 belonging to the operation path 101. [ The automatic protection switching device 202 of the second transmission medium 103 can perform the traffic path activation of the second transmission medium 103 using the transfer command received from the automatic protection switching device 201 of the backup path 102, Deactivation can be performed. The automatic protection switching device 202 can transfer the interrupt information and the switching information switching instruction to the general purpose processor 108 of the second transmission medium 103 by referring to the received switching command. The general purpose processor 108 can perform opening and closing of the traffic path of the optical transmission network framer 107 using the transferred switch command. However, the automatic protection switching device 202 does not necessarily have to transmit the transferred transfer command to the general-purpose processor 108, but can directly transfer the transfer command to the optical transmission network framer 107 to perform opening and closing of the traffic path.

The general purpose processors 108 and 109 may use interrupt information and switching information to perform interrupt service routines and turn on or off ODUk switching in the optical network framers 107 and 110. In addition, the automatic protection switching devices 201 and 202 do not transfer the interrupt request information and the switching information to the general-purpose processors 108 and 109 but directly to the optical network framers 107 and 110 to turn on or off the ODUk switching .

The optical transport network framer 110 of the first transmission medium 104 of the backup path 102 includes the APS message 301 in the OTN frame header to transmit the optical transport network framer 114 of the remote third transmission medium 106 to the APS Message 301. < / RTI > The third transmission medium 106 belongs to the redundant path 102 as well as the first transmission medium 104. The automatic protection switching device 201 of the first transmission medium 104 may generate the APS message 301 by performing Automatic Protection Switching (APS) protocol of recommendation G.873.1 of ITU-T. In addition, the optical transmission network framer 110 of the first transmission medium 104 may generate and transmit the APS message 301 by performing the APS protocol. The optical transport network framer 110 of the first transmission medium 104 records the APS message 301 in the Optical Data Unit k (ODUk) frame of ITU-T Recommendation G.709, To the optical transmission network framer 114 of the optical transmission network.

The optical transport network framer 114 of the third transmission medium 106 can extract the APS message 301 and deliver it to the automatic protection switching device 203. [ The automatic protection switching device 203 of the third transmission medium 106 can additionally consider the APS message 301 to determine the protection switching state. That is, in determining the protection switching state using the signal failure information received from the automatic protection switching device 204 of the fourth transmission medium 105 and the signal failure information of the third transmission medium 106, an APS message 301) may be additionally considered.

The automatic protection switching device 203 may determine whether to activate the traffic path of the third transmission medium 106 and the fourth transmission medium 105 considering the received APS message 301 additionally. The automatic protection switching device 203 can determine the protection switching state using the APS message 301 and can generate the switching command and transmit the switching command to the general purpose processor 113. [ Or the automatic protection switching device 203 may directly transmit the generated transfer command to the optical network framer 114 to perform opening and closing of the traffic path of the third transmission medium.

The automatic protection switching device 203 can generate a transfer command and transmit it to the automatic protection switching device 204 of the fourth transmission medium 105 of the operation path 101. [ The automatic protection switching device 204 of the fourth transmission medium 105 can transfer interrupt information and switching information to the general purpose processor 112 by using the transferred switching command. Or the automatic protection switching device 204 may directly transmit the interrupt information and the switching information to the optical transmission network framer 111. [

The traffic path switching of the third transmission medium 106 and the fourth transmission medium 105 can be performed through the switching command generated by the automatic protection switching apparatus 203 using the received APS message 301. [ The remote third transmission medium 106 and the general purpose processors 113 and 112 of the fourth transmission medium 105 that have received the interrupt information and the switching information perform ODUk switching in accordance with the determined switching state (ON or OFF) The switching information may be transmitted to the optical transmission network framers 114 and 111 so that the ODUk switching is performed.

4 is a diagram illustrating a configuration of an automatic protection switching device according to an embodiment.

The automatic protection switching device 201 may include a detection unit 401, a priority determination unit 402, a transfer status determination unit 403, a transfer command generation unit 404, and a delay timer 405. The detection unit 401 can detect the signal failure information or the signal attenuation information of the preliminary path 102 by receiving the failure information on the signal from the optical transmission network framer 110. The signal failure information detected by the detection unit 401 is referred to as first signal failure information 406. [ The detecting unit 401 can receive the first signal failure information 406 that the optical transmission network framer 110 extracts from the ODUk (Optical Data Unit k; ODUk) frame of Recommendation G.709 of ITU-T.

The detection unit 401 can detect the first signal failure information 406 and transmit it to the delay timer 405. [ The detection unit of the automatic protection switching device 202 of the operation path 101 can detect the signal failure information of the operation path 101 and is called the second signal failure information 407. [ The automatic protection switching device 201 may receive the second signal failure information 407 and may transmit the received second signal failure information 407 to the delay timer 405. [ The delay timer 405 outputs the second signal failure information 407 of the operation path 101 and the first signal failure information 406 of the spare path 102 after the specified delay time, And the first signal failure information 406 to the priority determining unit 402. [

The priority determining unit 402 may receive operator command information from the general purpose processor 109. [ The information on the operator command transmitted by the general purpose processor 109 is called the command information 410. [ The instruction information 410 may be communicated from the illustrated general purpose processor 109, CPU (central processing unit), or host processor. The operator can pass the command information 410 to the central main processor, and the main processor can deliver the command information 410 to the host processor of each transmission medium.

The priority determining unit 402 can determine the processing priority by comparing the first signal failure information 406 and the second signal failure information 407 received through the delay timer 405. [ The priority determining unit 402 can determine the processing priority of the signal failure information 406 and 407 by referring to the determined priority table. The priority determining unit 402 can determine the processing priority of the received command information 410. [ The priority determining unit 402 can determine the processing priority of the signal failure information 406 and 407 and the processing priority of the command information. The priority determining unit 402 may determine the processing priority of the signal failure information 406 and 407 and the processing priority of the command information 410 and may transmit the determination result to the switching state determination unit 403. [ According to an embodiment, the priority determining unit 402 may determine the priority by further considering the APS message received from the external transmission medium.

Referring to FIG. 4, an APS message received by the optical transmission network framer 110 and delivered to the priority determining unit 402 is referred to as a second APS message 409. The priority determining unit 403 may determine the priority by further considering the received signal failure information 406 and 407 and the command information 410 as the APS message 409 of the external transmission medium have.

The transfer status determination unit 403 can generate the APS message of the first transmission medium 104 according to the processing priority of the determined signal failure information 406 and 407 and the processing priority of the command information. The APS message generated by the switch-state determining unit 403 is referred to as a first APS message 408. [ The switching state decision unit 403 can generate a first APS message 408 associated with the first transmission medium 104 by performing an Automatic Protection Switching (APS) protocol of ITU-T Recommendation G.873.1 . The transfer status determination unit 403 may transmit the first APS message 408 to the optical transmission network framer 110 of the first transmission medium 104. [ The optical network framer 110 may forward the received first APS message 408 to a remote transmission medium. The optical transport network framer 110 records the first APS message 408 in the ODUk frame of Recommendation G.709 of ITU-T as described above, To the transport network framer 114.

The transfer status determination unit 403 refers to the processing priority order of the signal failure information 406 and 407 and the processing priority order of the command information 410 to determine which of the first transmission medium 104 and the second transmission medium 103 It is possible to decide whether or not to activate one traffic path. The switching state determination unit 403 can determine the switching state 411 of the first transmission medium 104 and the second transmission medium 103 according to the determined activation state.

The switching state determining unit 403 can determine the switching state 411 by comparing the signal failure information having the higher priority with the signal failure information having the higher priority, The transfer state 411 can be determined by comparing the high command information. The transfer status determination unit 403 determines the transfer status 411 and transfers it to the transfer command generation unit 404.

The transfer command generation unit 404 may generate a transfer command 412 for changing the traffic path of the first transmission medium 104 and the second transmission medium 103 in accordance with the received transfer status 411. [ The transfer command generation unit 404 can transfer the generated transfer command 412 to the general purpose processor 109 of the first transmission medium 104 or directly to the optical transmission network framer 110. [ The transfer command generation unit 404 may transfer the generated transfer command 412 to the automatic protection switching apparatus 202 of the operation path 101. [ That is, the automatic protection switching device 201 of the first transmission medium 104 generates the switching command 412 and outputs the switching command 412 to the second transmission medium 103 of the operation path 101 and the first transmission medium 102 of the backup path 102 It is possible to perform the traffic path opening / closing of the network 104.

The transfer command 412 generated by the transfer command generation unit 404 may include interrupt information and switching information. The automatic protection switching devices 202 and 201 of the operation path 101 and the backup path 102 are switched to the traffic of each transmission medium 103 and 104 by using the switching command 412 generated from the switching command generation unit 404, The procedure for controlling the path is as described above.

FIG. 5 is an exemplary diagram illustrating an automatic protection switching apparatus according to an embodiment of the present invention.

As described with reference to FIG. 4, the automatic protection switching apparatus receives the signal failure information, the APS message, and the command information separately for each channel, and generates and outputs a switching command. As described above, the transfer command may include interrupt information and switching information. The automatic protection switching device may be configured for each channel, and each of the automatic protection switching devices operates independently for each channel to determine a switching state based on signal failure information, APS message, and command information input for each channel, It is possible to quickly output the corresponding switch command (interrupt information and switching information).

6 is a flowchart illustrating an automatic protection switching method according to an embodiment.

(601) the signal failure information based on the signal received from the optical network framer. Each automatic protection switching device belonging to the transmission medium of the operational path and the backup path uses the signal received from the optical transmission network framer if the signal failure occurs at the receiving port of the optical transmission network framer, It is possible to detect the fault information. The signal failure information may include information on signal failure or signal attenuation.

The automatic protection switching apparatus determines whether or not to transmit the detected signal failure information according to whether the path is the operation path or the reserved path. (602) The automatic protection switching apparatus of the transmission path of the operation path transmits the signal failure information of the operation path (603) The automatic protection switching apparatus of the transmission medium of the backup path can receive the signal failure information of the operational path transmitted by the automatic protection switching apparatus in the operational path (604) The automatic protection switching device of the transmission medium of the operation path and the backup path may have the same configuration, and perform different functions depending on whether they belong to the operation path or the backup path by the same automatic protection switching device. In step 602, the detected signal failure information can be transmitted and received according to whether the automatic protection switching apparatus that detects each signal failure information of the operational path and the backup path belongs to the operational path or the backup path.

The automatic protection switching apparatus belonging to the spare path can receive the signal failure information of the operational path and detect the signal failure information of the spare path to determine the signal failure information of the operational path and the processing priority of the signal failure information of the spare path. (607) In addition, the automatic protection switching device belonging to the spare path can receive (605) the command information inputted by the operator through the general-purpose processor and determine the processing priority of the received command information. (607) , An APS message is received from an external transmission medium (606), and the priority can be determined by further considering the APS message.

The automatic protection switching apparatus can determine (608) the transfer status of the transmission medium and the backup path of the operational path by using the processing priority of the determined signal failure information and the processing priority of the command information, Same as.

Further, by using the determined processing priority, the automatic protection switching apparatus of the backup path can generate the APS message 609 of the transmission medium of the backup path associated with the transmission medium of the operation path and the transmission medium of the backup path of the backup path, It can be transferred 610 to an external transmission medium belonging to the spare path.

The automatic protection switching device can generate a switching command 611 for controlling the traffic opening and closing of the transmission medium of the operational path and the transmission medium of the backup path based on the determined switching condition. The details of the transfer command 611 are as described above. The automatic protection switching device can transmit (612) the generated transfer command to the optical path network framer of the transmission path of the backup path to perform the traffic opening / closing of the backup path. The automatic protection switching device can transmit the generated switching command to the automatic protection switching device in the operational path (613), and the automatic protection switching device in the operational path can perform traffic opening / closing of the operating path by using the transferred switching command have.

The configuration of the automatic protection switching device in the operation path and the configuration of the automatic protection switching device in the backup path may be the same and the function may be different depending on whether it belongs to the operation path or the backup path. The automatic protection switching device of the operational path detects the signal failure information of the operational path and transmits it to the automatic protection switching device of the backup path and receives the switching command from the automatic protection switching device of the backup path to perform the traffic opening / have. The automatic protection switching apparatus of the backup path can receive the signal failure information of the operational path from the automatic protection switching apparatus of the operational path and detect the signal failure information of the spare path. The automatic protection switching apparatus of the backup path can generate a switching command according to whether the transmission path of the transmission medium of the operational path and the transmission path of the transmission path of the spare path are changed or not and performs traffic opening and closing of the spare path by using the generated switching command . Also, the automatic protection switching apparatus of the backup path can transmit the generated switching command to the automatic protection switching apparatus of the operational path.

The method according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

101: Operation route
102: Reserved route
201, 202, 203 and 204: automatic protection switching device

Claims (20)

A detector for detecting first signal failure information based on a signal of the first transmission medium;
A priority determining unit for determining a priority of the failure signal processing of the first signal failure information and the second signal failure information based on the second signal failure information and the first signal failure information of the second transmission medium;
A transfer status determination unit for determining whether to activate the traffic path of either the first transmission medium or the second transmission medium based on the failure signal processing priority and determining a switching status according to the activation status; And
A transfer command generating unit for generating a transfer command for changing a traffic path of the first transmission medium and the second transmission medium according to the transfer status,
Containing
Automatic protection switching device of optical transmission network system.
The method according to claim 1,
The priority determining unit determines the failure signal processing priority by referring to a predetermined priority table
Automatic protection switching device.
The method according to claim 1,
Wherein the priority determining unit receives command information from an operator, determines a command processing priority of the command information,
Wherein the transfer status determination unit further determines the transfer status based on the command processing priority
Automatic protection switching device.
The method of claim 3,
The transfer status determiner performs an Automatic Protection Switching (APS) protocol of Recommendation G.873.1 of the ITU-T to determine whether the first APS of the first transmission medium based on the failure signal processing priority and the command processing priority, Message,
Wherein the automatic protection switching device transmits the first APS message to a third transmission medium
Automatic protection switching device.
The method of claim 3,
Wherein the transfer state determination unit compares the fault signal processing priority and the previous fault signal processing priority and compares the instruction processing priority and the previous instruction processing priority to determine the transfer state,
Automatic protection switching device.
5. The method of claim 4,
Wherein the transfer status determination unit transmits the first APS message to an optical transmission network framer of the first transmission medium,
The optical transport network framer records the first APS message in an ODUk (Optical Data Unit k; ODUk) frame of Recommendation G.709 of ITU-T and transmits the first APS message to the third transmission medium
Automatic protection switching device.
5. The method of claim 4,
Wherein the priority determining unit determines the failure signal processing priority and the instruction processing priority based additionally on a second APS message of the fourth transmission medium received from the fourth transmission medium
Automatic protection switching device.
8. The method of claim 7,
Wherein the priority determining unit receives the second APS message extracted from the ODUk (Optical Data Unit k; ODUk) frame of ITU-T recommendation G.709 by the optical transmission network framer of the first transmission medium
Automatic protection switching device.
The method according to claim 1,
The detector receives the signal of the first transmission medium extracted from the ODUk (Optical Data Unit k; ODUk) frame of recommendation G.709 of ITU-T and transmitted by the optical transmission network framer of the first transmission medium,
Characterized in that the priority determining unit receives the second signal failure information detected by the detection unit of the second linear automatic protection switching apparatus of the second transmission medium
Automatic protection switching device.
The method according to claim 1,
And a delay timer for transmitting the first signal failure information and the second signal failure information to the priority determining unit after a specified delay time
More included
Automatic protection switching device.
The method according to claim 1,
Wherein the switching command includes interrupt information, which is an instruction to interrupt the operation of the first transmission medium or the second transmission medium, and switching information for opening / closing a traffic path of the first transmission medium or the second transmission medium doing
Automatic protection switching device.
12. The method of claim 11,
Wherein the transfer command generation unit transfers the transfer command to the general purpose processor of the first transmission medium,
Wherein the general purpose processor performs an interrupt service routine based on the interrupt information and transfers the switching information to the optical transmission network framer of the first transmission medium to open and close the traffic path of the optical transmission network framer
Automatic protection switching device.
12. The method of claim 11,
The transfer command generator transmits the transfer command to the optical transmission network framer of the first transmission medium, and opens and closes the traffic path of the optical transmission network framer
Automatic protection switching device.
12. The method of claim 11,
Wherein the transfer command generation unit transmits the transfer command to the second transmission medium and controls activation of the second transmission medium
Automatic protection switching device.
In an optical transmission network system,
Detecting a first signal failure information of a first transmission medium belonging to a spare path,
Generating a first transfer command for changing a traffic path of the first transmission medium and the second transmission medium based on the first signal failure information and the second signal failure information of the second transmission medium belonging to the operation path; 1 automatic protection switching device; And
A second automatic protection switching device for detecting the second signal failure information and transmitting the second signal failure information to the first automatic protection switching device,
Containing
Linear automatic protection switching system.
16. The method of claim 15,
Wherein the first automatic protection switching device controls activation of a traffic path of the first transmission medium based on the first switching command,
And the second automatic protection switching device controls activation of a traffic path of the second transmission medium based on the first switching command
Linear automatic protection switching system.
16. The method of claim 15,
The first automatic protection switching device generates a first APS message based on the failure signal processing priority of the first signal failure information and the second signal failure information and transmits the first APS message to a third transmission medium belonging to the spare path
Linear automatic protection switching system.
18. The method of claim 17,
Based on the first APS message, the third signal failure information of the third transmission medium, and the fourth signal failure information of the fourth transmission medium belonging to the operation path, A third automatic protection switching device for generating a second switching command for changing a traffic route; And
A fourth automatic protection switching device that detects the fourth signal failure information and transmits the fourth signal failure information to the third automatic protection switching device,
Further comprising
Linear automatic protection switching system.
19. The method of claim 18,
The third automatic protection switching device controls activation of a traffic path of the third transmission medium based on the second switching command,
Wherein the fourth automatic protection switching device controls activation of a traffic path of the fourth transmission medium based on the second switching command
Linear automatic protection switching system.
Detecting first signal failure information based on a signal of a first transmission medium belonging to a spare path;
Determining a failure signal processing priority of the first signal failure information and the second signal failure information based on the second signal failure information and the first signal failure information received from the second transmission medium belonging to the operational path;
Determining whether to activate the traffic path of either the first transmission medium or the second transmission medium based on the failure signal processing priority, and determining a switching state according to the activation or non-activation; And
Generating a transfer command for changing a traffic path of the first transmission medium and the second transmission medium according to the transfer status;
Containing
A linear automatic protection switching method of optical transmission network system.
KR1020150037357A 2015-03-18 2015-03-18 Device and system for linear automatic protection switching in optical transport network system, and method using the same KR20160112166A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112448755A (en) * 2019-08-30 2021-03-05 中兴通讯股份有限公司 Method, device and equipment for realizing optical channel 1+1 protection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112448755A (en) * 2019-08-30 2021-03-05 中兴通讯股份有限公司 Method, device and equipment for realizing optical channel 1+1 protection

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